King Size Luxury Tencel Mattress Protector, 100% Waterproof, Ultra Soft, Naturally Cooling & Breathable, Deep Pocket Up to 18"

This. This is the one we got, and have been *really* happy with it. It's basically silent (some are noisy), and nearly as breathable as our previous non-waterproof mattress pad. We've washed it a bunch, and while it takes a while to dry on extra low, it's held up really well. https://www.amazon.com/dp/B088PGGMWF?th=1